void start_video( ) { if (deckLinkOutput->StartScheduledPlayback(0, 100, 1.0) != S_OK) { throw std::runtime_error( "Failed to start scheduled playback!\n" ); } }
void BMDOutputDelegate::StartRunning () { IDeckLinkDisplayMode* videoDisplayMode = NULL; // Get the display mode for 1080i 59.95 - mode 6 // Changed to NTSC 23.98 - JB 20110215 videoDisplayMode = GetDisplayModeByIndex(1); if (!videoDisplayMode) return; m_frameWidth = videoDisplayMode->GetWidth(); m_frameHeight = videoDisplayMode->GetHeight(); videoDisplayMode->GetFrameRate(&m_frameDuration, &m_frameTimescale); // Calculate the number of frames per second, rounded up to the nearest integer. For example, for NTSC (29.97 FPS), framesPerSecond == 30. m_framesPerSecond = (unsigned long)((m_frameTimescale + (m_frameDuration-1)) / m_frameDuration); QImage image(m_frameWidth,m_frameHeight, QImage::Format_ARGB32); image.fill(Qt::green); //m_frame = VideoFramePtr(new VideoFrame(image, 1000/30)); HRESULT res; // Set the video output mode if (m_deckLinkOutput->EnableVideoOutput(videoDisplayMode->GetDisplayMode(), bmdVideoOutputFlagDefault) != S_OK) { //fprintf(stderr, "Failed to enable video output\n"); qDebug() << "BMDOutputDelegate::StartRunning(): Failed to EnableVideoOutput()"; goto bail; } res = m_deckLinkOutput->CreateVideoFrame( m_frameWidth, m_frameHeight, m_frameWidth * 4, bmdFormat8BitBGRA, bmdFrameFlagDefault, &m_rgbFrame); if(res != S_OK) { qDebug() << "BMDOutputDelegate::StartRunning: Error creating RGB frame, res:"<<res; goto bail; } res = m_deckLinkOutput->CreateVideoFrame( m_frameWidth, m_frameHeight, m_frameWidth * 2, bmdFormat8BitYUV, bmdFrameFlagDefault, &m_yuvFrame); if(res != S_OK) { qDebug() << "BMDOutputDelegate::StartRunning: Error creating YUV frame, res:"<<res; goto bail; } // // Generate a frame of black // if (m_deckLinkOutput->CreateVideoFrame(m_frameWidth, m_frameHeight, m_frameWidth*2, bmdFormat8BitYUV, bmdFrameFlagDefault, &m_videoFrameBlack) != S_OK) // { // fprintf(stderr, "Failed to create video frame\n"); // goto bail; // } // FillBlack(m_videoFrameBlack); // // // Generate a frame of colour bars // if (m_deckLinkOutput->CreateVideoFrame(m_frameWidth, m_frameHeight, m_frameWidth*2, bmdFormat8BitYUV, bmdFrameFlagDefault, &m_videoFrameBars) != S_OK) // { // fprintf(stderr, "Failed to create video frame\n"); // goto bail; // } // FillColourBars(m_videoFrameBars); // Begin video preroll by scheduling a second of frames in hardware m_totalFramesScheduled = 0; for (unsigned i = 0; i < m_framesPerSecond; i++) { PrepareFrame(); ScheduleNextFrame(true); } // Args: startTime, timeScale, playback speed (1.0 = normal) m_deckLinkOutput->StartScheduledPlayback(0, 100, 1.0); m_running = true; return; bail: // *** Error-handling code. Cleanup any resources that were allocated. *** // StopRunning(); }
HRESULT render( mlt_frame frame ) { HRESULT result = S_OK; // Get the audio double speed = mlt_properties_get_double( MLT_FRAME_PROPERTIES(frame), "_speed" ); if ( speed == 1.0 ) { mlt_audio_format format = mlt_audio_s16; int frequency = bmdAudioSampleRate48kHz; int samples = mlt_sample_calculator( m_fps, frequency, m_count ); int16_t *pcm = 0; if ( !mlt_frame_get_audio( frame, (void**) &pcm, &format, &frequency, &m_channels, &samples ) ) { int count = samples; if ( !m_isPrerolling ) { uint32_t audioCount = 0; uint32_t videoCount = 0; // Check for resync m_deckLinkOutput->GetBufferedAudioSampleFrameCount( &audioCount ); m_deckLinkOutput->GetBufferedVideoFrameCount( &videoCount ); // Underflow typically occurs during non-normal speed playback. if ( audioCount < 1 || videoCount < 1 ) { // Upon switching to normal playback, buffer some frames faster than realtime. mlt_log_info( &m_consumer, "buffer underrun: audio buf %u video buf %u frames\n", audioCount, videoCount ); m_prerollCounter = 0; } // While rebuffering if ( isBuffering() ) { // Only append audio to reach the ideal level and not overbuffer. int ideal = ( m_preroll - 1 ) * bmdAudioSampleRate48kHz / m_fps; int actual = m_fifo->used / m_channels + audioCount; int diff = ideal / 2 - actual; count = diff < 0 ? 0 : diff < count ? diff : count; } } if ( count > 0 ) sample_fifo_append( m_fifo, pcm, count * m_channels ); } } // Create video frames while pre-rolling if ( m_isPrerolling ) { createFrame(); if ( !m_videoFrame ) { mlt_log_error( &m_consumer, "failed to create video frame\n" ); return S_FALSE; } } // Get the video if ( mlt_properties_get_int( MLT_FRAME_PROPERTIES( frame ), "rendered") ) { mlt_image_format format = mlt_image_yuv422; uint8_t* image = 0; uint8_t* buffer = 0; if ( !mlt_frame_get_image( frame, &image, &format, &m_width, &m_height, 0 ) ) { m_videoFrame = (IDeckLinkMutableVideoFrame*) mlt_deque_pop_back( m_videoFrameQ ); m_videoFrame->GetBytes( (void**) &buffer ); if ( m_displayMode->GetFieldDominance() == bmdUpperFieldFirst ) // convert lower field first to top field first swab( image, buffer + m_width * 2, m_width * ( m_height - 1 ) * 2 ); else swab( image, buffer, m_width * m_height * 2 ); m_deckLinkOutput->ScheduleVideoFrame( m_videoFrame, m_count * m_duration, m_duration, m_timescale ); mlt_deque_push_front( m_videoFrameQ, m_videoFrame ); } } else { mlt_log_verbose( &m_consumer, "dropped video frame\n" ); } ++m_count; // Check for end of pre-roll if ( ++m_prerollCounter > m_preroll && m_isPrerolling ) { // Start audio and video output m_deckLinkOutput->EndAudioPreroll(); m_deckLinkOutput->StartScheduledPlayback( 0, m_timescale, 1.0 ); m_isPrerolling = false; } return result; }